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High charge-discharge magnification lithium iron phosphate material used for anode of lithium ion battery and its preparation method

A lithium-ion battery, charge-discharge rate technology, applied in electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve problems such as the performance impact of lithium iron phosphate, and achieve strong high-rate charge-discharge capacity, high specific capacity, good Effects of Cyclic Stability

Inactive Publication Date: 2007-05-30
NANKAI UNIV
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Problems solved by technology

In addition, the synthesis method also has a certain influence on the performance of lithium iron phosphate

Method used

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  • High charge-discharge magnification lithium iron phosphate material used for anode of lithium ion battery and its preparation method
  • High charge-discharge magnification lithium iron phosphate material used for anode of lithium ion battery and its preparation method

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Embodiment

[0021] Hereby further understand content and advantage of the present invention with following embodiment:

[0022] Weigh FeC 2 o 4 2H 2 O 17.99g, LiOH·H 2 O 4.196g, (NH 4 ) 2 HPO 4 13.21 g, PEG (M=5000) 5 g. Disperse the above raw materials with 200mL deionized water as a suspension, add citric acid (C 7 h 8 o 7 ·H 2 O) 42.02g. Continue stirring until a gel forms. The resulting gel was pulverized by an agate ball mill and put into a porcelain crucible. at a velocity of 1dm 3 min -1 99.999% argon flow, at 3°C·min -1 The temperature was raised to 300°C at the same rate and kept for 3 hours, and the temperature was raised to 700°C at the same rate and kept for 8 hours. Naturally cool to room temperature with the furnace, take out the product and grind to obtain the lithium iron phosphate.

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Abstract

This invention relates to one lithium ion battery anode charging ferric phosphate lithium materials and its process method, which processes the front drive by gel-sol method under 30 to 90 degrees by materials of lithium compound, ferric compound and phosphate compound and conductive materials; then heating the front driver in inertia or weak educing atmosphere for analyzing under 100 to 450 degrees; in same atmosphere, heating by 1-30DEG C / min-1 and forging under 450 to 800 degrees for 2 to 24 hours and then culling naturally to get aim product.

Description

technical field [0001] The invention belongs to the technical field of energy materials. In particular, it relates to a lithium iron phosphate material with a high charge and discharge rate for the positive electrode of a lithium ion battery and a preparation method thereof. Background technique [0002] In 1997, Goodenough discovered that lithium iron phosphate with an olivine structure can reversibly intercalate and deintercalate lithium ions. Since then, lithium iron phosphate has been considered as one of the optional electrode materials for lithium-ion batteries. Preliminary research shows that the material has many advantages: no precious metals, cheap raw materials, extremely rich resources; non-toxic, environmentally friendly; moderate working voltage (3.4V); good platform characteristics, with a flat The charging and discharging voltage curve, within a certain range, its voltage accuracy is even comparable to the regulated power supply, it is an ideal lithium-ion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/62H01M4/04C01B25/45
CPCY02E60/10
Inventor 焦丽芳袁华堂王一菁赵明孙均利章明王伟
Owner NANKAI UNIV
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